What factors affect the low temperature performance of lithium iron phosphate battery packs

What factors will affect the low temperature performance of lithium iron phosphate battery packs? 1. Positive structure. Under the ultra-low temperature standard, the three-dimensional structure of the battery cathode material limits the external diffusion rate of the lithium iron phosphate battery rechargeable battery. Under the standard of -20℃, the charge and discharge capacity of lithium iron phosphate battery rechargeable batteries can only achieve% of the volume at room temperature, while nickel-cobalt-manganese ternary batteries can achieve %. At -20°C, the charge-discharge volume of a lithium manganate battery reaches 83% of the volume at room temperature. 2. Organic solvents with high melting point. The high melting point organic solvent in the rechargeable lithium iron phosphate battery increases the viscosity in the ultra-low temperature natural environment. When the temperature is too low, condensation will occur, thereby reducing the transmission rate of the lithium battery in the lithium battery electrolyte. Third, it is the external diffusion rate of lithium batteries. The ultra-low temperature external diffusion rate of lithium batteries in the negative stage of high-purity graphite is reduced; the reduction of the external diffusion rate of lithium batteries on the negative stage of high-purity graphite is the key reason for the decrease of the ultra-low temperature characteristics of lithium batteries. plastic film. The negative stage of the lithium iron phosphate battery rechargeable battery thickens the SEI film in the ultra-low temperature natural environment, and the characteristic impedance of the SEI film increases, which causes the conductivity of the lithium battery in the SEI film to decrease, and finally the lithium battery is charged in the ultra-low temperature natural environment. Polarization occurs and the high efficiency of battery charging decreases. Lithium iron phosphate battery rechargeable battery has low energy density, deviation of ultra-low temperature characteristics, the battery cannot be charged at ultra-low temperature, nominal voltage:, safety factor is very good, so far there is no lithium iron battery with good ultra-low temperature characteristics. Lithium iron phosphate battery lithium battery pack has a fatal flaw, that is, the ultra-low temperature characteristics are weak, even if it is nano-technology, carbon coating can not solve this problem. If such a situation occurs, the machinery and equipment cannot start working. Lithium batteries have the characteristics of reduced charge and discharge working voltage, reduced charge and discharge volume, fast volume attenuation coefficient, and poor multiple characteristics in an ultra-low temperature natural environment. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the standards for military low-temperature lithium batteries?